"La bestia, la tragedia de migrantes centroamericanos en México", es un libro que expande y profundiza lo visto en el documental la Bestia, y expone con más detalle las dificultades, los peligros y sentimientos que enfrentan miles de seres humanos que salen desde sus países de origen en Centroamérica para transitar por una de las rutas más arriesgadas y violentas de todo el mundo para migrantes indocumentados. Como escritor, Pedro Ultreras se vale del profuso material producido durante y después de la filmación de su película y lo transfiere a una dimensión más amplia, narrando las aventuras, los peligros y las hazañas vividas por los migrantes y por él mismo -montado también sobre la bestia- a través del temible trayecto que estos osados seres humanos siguen en pos de una prosperidad económica que con frecuencia los lleva a un trágico desenlace de sus planes. Así, el documentalista mexicano presenta en este libro un recuento de los sucesos más recientes como la atroz masacre de migrantes en Tamaulipas en 2010, la dramática caravana de familias en busca de migrantes desparecidos en 2011, así como un análisis de la primera ley de migración expedida por el gobierno mexicano que a principios del 2012 aún no se implementa. "La bestia, la tragedia de migrantes centroamericanos en México" (The beast, the tragedy of Central American migrants in Mexico) is a book that expands and goes in depth about what was seen in the documental "The Beast," exposing in detail the difficulties, the dangers and the feelings faced by thousands of human beings who leave their home countries in Central America. They travel through one of the most risky and violent routes in the world for undocumented immigrants as they cross through Mexico on top of "la bestia" (or the beast), as the perilous freight trains they ride to try to make it to the United States is called. Journalist, filmmaker and author, Pedro Ultreras (7 Soles, 2007) makes use of the profuse material he produced during and after the shooting of his documentary "The Beast" and transfers it to a deeper dimension, narrating the adventures, the hazards and the deeds lived by these migrants and himself -as he also rides "the beast" along migrants- go through on the dreadful journey that these daring men and women follow in pursuit of an economic prosperity that often leads them to a tragic outcome of their plans. La bestia, la tragedia de migrantes centroamericanos en México is a well-documented book that serves as a historical record of the most recent events about of the phenomenon of Central American migration, as well as gathers the testimonies of the migrants he meets along the "migrant's route", presenting his chilling interviews with men and women who desperately seek to reach the U.S. In this book, Ultreras presents a summary of the 2010 atrocious mass massacre of migrants in Mexico, the 2011 dramatic caravan of Central American family members seeking their missing relatives in Mexico, as well as a brief analysis of the first ever immigration law the Mexican government enacted in the wake of the mass killings of migrants. La bestia, la tragedia de migrantes centroamericanos en México is profusely enriched with photographs taken by the author.